I’m in the same boat, but my plan is to do a fresh install of the OS on the SSD once I get it:

1- Backup HDD to external storage.
2- Do a fresh install of the OS on the SSD
3- Reformat the HDD (not the external backup one, of course)
4- Transfer the main data from the external backup to the HDD.
5- Keep the backup safe in case something goes wrong.

If you don’t want to do a fresh install, there are other, simpler methods:Lifehacker

Installing a solid-state drive is one of the best upgrades you can make for your desktop computer. And the easiest way to get one into your system is to physically install it, connect the right cables, and reinstall Windows from scratch.

just as @GabD says. best thing to do is a fresh install. less junk and cleaner image. thats what i do. little more hassle setting it up but once completed…it will make you smile. I have a 250Gb SSD and it is the best purchase i have made. going for a 1TB later. to save applciations/files too and keep the OS on the SSD.